Tussar silk is obtained from

Tussar silk is obtained from Antheraea roylei.
Tussar silk also known as kosa silk is produced from larvae of several species of silkworms belonging to the moth genus Antheraea.
These silkworms live in the wild forests in trees belonging to Terminalia species and Shorea robusta, as well as other food plants such as jamun and oak found in South Asia, eating the leaves of the trees on which they live.
Tussar silk is valued for its rich texture and natural, deep-gold colour, and varieties are produced in many countries, including India, Japan and Sri Lanka.